Abstract
Taking the use of Nb and Si elemental powders as raw materials, Nb/Nb 5Si 3 composites were successfully fabricated by a spark plasma sintering (SPS) technology. The influence of sintering temperatures on microstructures of the synthesized composites was mainly investigated. The results show that there exists a critical sintering temperature T c (1400 °C) in the synthesis of Nb/Nb 5Si 3 composites by SPS technology. When sintering temperature is lower than T c, an intermediate Nb 3Si phase is produced in the fabricated samples. Moreover, the relative density of the samples is lower. Only if the sintering temperature is higher than T c, the intermediate Nb 3Si phase is thoroughly eliminated, Nb particles become a finer size and desirable Nb/Nb 5Si 3 composites up to 99.59% theoretic density are achieved.
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